Food is provided is for the meal paid for and not for any other future meals. It has been paid for by the business owners and makes the business unprofitable at the price charged so the price charged to everyone has to be increased
Yes, but what if you can't eat that much in one go, especially in the morning:
we used to have fruit juice, cereal, yoghurt, croissants with ham and cheese, followed by a very large full English, finishing off with toast and honey, and three fresh coffees! 
I may have some yoghurt with fruit, scrambled egg, bacon and mushrooms with a piece of toast and tea. So if I have picked up a banana which I couldn't manage I would take it for elevenses.
(but I have seen people making up rolls and sandwiches for their lunch!)